Merge pull request #4 from DRA2840/master

Add a menu to main game screen, fix bugs in screen transitions and other issues
Merge pull request #2 from DRA2840/master

Att (1) repository libgdx
Mudando a versão.
Merge branch 'master' of http://github.com/gabrielsr/bomberman-libgdx
Merge branch 'master' of https://github.com/dayof/bomberman-libgdx